The research of the Cold Molecular Ions Group at the University of Basel (Switzerland) is concerned with the preparation and control of cold molecules and molecular ions and their applications. The research of the group is highly interdisciplinary and with relevance to both physics and chemistry. Current projects include the study and control of chemical reactions of single molecules, the development of new "molecular" quantum technologies, precision spectroscopic measurements on molecules and precise characterisations of chemical reaction mechanisms using controlled molecules.